Table 2 Categories and subcategories from the qualitative content analysis
| Altruistic reasons | Personal reasons | External reasons and factors | |
|---|---|---|---|
| Reasons for participating |
To help other adolescents in the same situation To contribute to research and improved care Participating was the right thing to do |
Meeting others in the same situation Educational objectives | Parents as facilitators |
| Reasons for not participating |
Meeting others in the same situation Being healthy and therefore not needing the study Fearing what the study would evoke and demand of me | Parents as barriers |